There was more to the Trump campaign than just misinformation on social media. Without wanting to rehash old discussions I think it's fair to say that most of the people who voted for Trump acknowledged his flaws but ultimately found Hillary Clinton less palatable.
Personally I don't think there was a single good candidate on the ballot.
Making Hillary unpalatable was part of the alt-right campaign to elect Trump. #SickHillary and other ways of killing her trustworthiness were campaigns imagined and put into effect by Trump sympathizers.
Yes, smear campaigns happen on both sides. I'm talking beyond that though. E.g. Some saw Clintons "career politics" as her being indoctrinated into the status quo whereas Trump represented a change.
I was as unhappy about the result as the next lefty but it doesn't help the situation to assume that all Trump supporters are ignorant, nor any of the worse accusations. Those supporters will have their reasons and if you want any hope of swaying their opinions then you have to listen to their arguments - something we did a poor job of in both the UK's EU referendum and the American election. We got preachy instead, so many on the opposing side kept their opinions quiet and we ended up not only misjudging the support of those campaigns had but ultimately losing the vote as well.
Personally I don't think there was a single good candidate on the ballot.